Jonny accesses the cave by climbing up a tree branch, and pressing a secret button hidden inside a fake bird's egg. The button causes a door inside the tree's bark to open which allows access to the cave. The "cave" is far larger than its appearances. It has a large melon-logo printed on the floor, it has a melon-peel styled staircase that circles the edges of the room with each step lighting up when individually stepped on, and it also contains a machine that transforms Jonny and Plank into Captain Melonhead and Splinter the Wonderwood.

The room is lined with lamps (complete with melon-like bases, lamp shades, etc.) to illuminate it.